129133812 has 24 divisors (see below), whose sum is σ = 302109696. Its totient is φ = 42930688.

The previous prime is 129133793. The next prime is 129133813. The reversal of 129133812 is 218331921.

It is a self number, because there is not a number n which added to its sum of digits gives 129133812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129133813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9453 + ... + 18644.

It is an arithmetic number, because the mean of its divisors is an integer number (12587904).

Almost surely, 2^129133812 is an apocalyptic number.

129133812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129133812 is an abundant number, since it is smaller than the sum of its proper divisors (172975884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129133812 is a wasteful number, since it uses less digits than its factorization.

129133812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28487 (or 28485 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 129133812 is about 11363.7059096054. The cubic root of 129133812 is about 505.4520828332.

The spelling of 129133812 in words is "one hundred twenty-nine million, one hundred thirty-three thousand, eight hundred twelve".